Product code generation system and method based on rfid tag

Abstract

The invention relates to the field of electronic information management, in particular to a product code generation system and method based on an rfid tag. According to the technical scheme, the product code generation system and method based on the rfid tag comprise the rfid tag, an rfid tag reader-writer, a data collecting and reading module, a ciphertext generation module, a code generation module, a data storage module and a management control module. In the prior art, when products produced in a production line are tracked and traced, the production process of the products is tracked and traced in a manual recording or bar code management mode, and the requirements of modern production for efficiency, accuracy and traceability are difficult to meet; according to the system, an rfid technology is combined with an encryption algorithm, and a secret key is generated based on a result of scanning an rfid label each time, so that production information of a product can be traced back to each process and link, and quick positioning and solving of a quality problem are facilitated.

Description

Technical Field

[0001] The present invention relates to the field of electronic information management, and in particular to a product code generation system and method based on RFID tags. Background Art

[0002] Consumers have increasingly higher requirements for product quality and safety, and the proliferation of counterfeit and shoddy products in the market has made the demand for product traceability by enterprises and consumers increasingly urgent. RFID technology has been widely used in production line automation management due to its advantages such as non-contact, fast reading, and large-capacity data storage. However, existing RFID systems focus more on basic information identification and tracking, and lack in-depth management of unique identification throughout the product life cycle. When tracking and tracing products produced in the production line, manual records or barcode management are used to track and trace the product production process, which is time-consuming and labor-intensive, with low accuracy, and the recorded data content is not sufficient and comprehensive, which can hardly meet the requirements of modern production for efficiency, accuracy and traceability. Summary of the invention

[0003] In order to overcome the problem of tracking and tracing the products produced in the production line, manual records or barcode management are used to track and trace the product production process, which is time-consuming, labor-intensive, and has low accuracy. In addition, the recorded data content is not sufficient and comprehensive, and it is difficult to meet the requirements of modern production for efficiency, accuracy and traceability.

[0004] The technical solution of the present invention is: a product code generation system based on RFID tags, comprising: Product production line, used to produce the required products in the form of assembly line operation; RFID tags, which are attached to products and are used to store and transmit information; RFID tag readers and writers are deployed in various processes of the production line to read and write information in RFID tags; The data acquisition and reading module is used to obtain the data read by the RFID tag reader from the RFID tag reader, wherein the read data includes time, operator number, factory number and production line number; The ciphertext generation module is used to generate a unique ciphertext using a preset algorithm according to the data acquired by the data acquisition and reading module; The code generation module is used to collect and organize the ciphertexts generated by all processes of the same product in the product production line, and generate codes based on the collected keys; A data storage module is used to store and back up the data generated by the data acquisition and reading module, the ciphertext generation module, and the code generation module; The management control module is used to monitor and manage the operation of the RFID tag reader, data acquisition and reading module, ciphertext generation module, code generation module and data storage module.

[0005] Preferably, products can be marked by RFID tags and RFID tag readers, and the production information of products can be tracked and recorded by data acquisition and reading modules and ciphertext generation modules to obtain information on each process of product production, and record the process information in the form of ciphertext. Finally, all ciphertexts are integrated using the code generation module to obtain a unique product code for the product. The product code contains a variety of product information such as the product production plant, product production line, product generation time, product processing steps, and person in charge of each product processing step, thereby providing strong support for product traceability and management.

[0006] Preferably, when attaching the RFID tag to the product, the following steps are included: S11: pre-configuring the data storage area inside the RFID tag through a dedicated RFID programming device and software, wherein the production date information and the production batch information of the product are entered into the data storage area of ​​the RFID tag; S12: At the initial stage of product production, the RFID tag is attached to the product, wherein the attachment methods used include pasting and embedding; S13: Using RFID programming equipment or software, assign a globally unique identification number to each RFID tag.

[0007] Preferably, when the RFID tag reader is deployed on the production line, the RFID tag reader deployment method includes: A11: Deploy an RFID tag reader at the start of the production line to read the production date and production batch information of the new products entering the production line; A12: Deploy RFID tag readers at each key process point on the production line to track and record product processing information; A13: Deploy RFID tag readers at the exit of finished products on the production line to verify product information; A14: Deploy RFID tag readers in the buffer and temporary storage areas of the production line to track the temporary storage and circulation of products.

[0008] Preferably, the RFID tag reader / writer includes the following steps when reading and writing information in the RFID tag: S21: The RFID tag reader transmits a radio frequency signal of a certain frequency and power through its antenna, and this signal forms an electromagnetic field in space; S22: When the RFID tag enters the RF field range emitted by the reader, the antenna in the tag captures enough energy to activate the RFID tag; S23: After the RFID tag is activated, the data stored in the RFID tag is sent back to the RFID tag reader / writer through backscatter modulation technology according to the pre-stored instructions and the request of the RFID tag reader / writer; S24: the RFID tag reader / writer decodes and identifies the data stored in the RFID tag, and identifies the identification number stored in the storage area of ​​the RFID tag; S25: Record the current product processing information according to the identification number stored in the storage area of ​​the identified RFID tag.

[0009] Preferably, when the RFID tag reader / writer records the current product processing information according to the identification number stored in the storage area of ​​the identified RFID tag, the recorded product processing information includes: A21: The time information of the product passing through the current process point, where the accuracy of the time information is accurate to seconds; A22: The operator number of the process point that the product passes through; A23: The production line number of the product; A24: The factory number where the product is produced.

[0010] Preferably, when the data acquisition module obtains the data read by the RFID tag reader from the RFID tag reader, the following steps are included: S31: The data acquisition and reading module enters the monitoring state and receives data packets from the RFID tag reader in real time; S32: parsing the received data packet, that is, separating each field in the data packet one by one according to a predetermined protocol and format; S33: extracting information from the parsed data packet, and then formatting the extracted information to convert the parsed information into a unified format; S34: Preliminary processing is performed on the extracted information, wherein the preliminary processing methods include deduplication, sorting and classification.

[0011] Preferably, when the ciphertext generation module generates a unique ciphertext using a preset algorithm according to the data acquired by the data acquisition and reading module, the ciphertext generation module includes the following steps: S41: Data preprocessing, processing the data into a data format and content suitable for key generation; S42: key generation, generating a unique key according to one or more of the factory number, the production line number and the production line number; S43: Data encryption processing, using the key obtained in step S42 to encrypt the data to obtain a ciphertext of a fixed length; S44: Ciphertext association processing, associating the obtained ciphertext with the identification number stored in the RFID tag corresponding to the product.

[0012] Preferably, the ciphertext generation module ensures the security of data format and content through data preprocessing, improves data encryption strength by using exclusive key generation technology, realizes the generation of fixed-length ciphertext, and is closely associated with the RFID tag identification number. This series of operations not only significantly enhances the security of the data, but also greatly improves the traceability of the data; at the same time, this process optimizes the information management process, supports efficient product query and anti-counterfeiting verification, reduces manual intervention, reduces the risk of errors, and lays a solid foundation for the automation and intelligent upgrade of the system, thereby comprehensively improving the overall performance and value of the product code generation system.

[0013] Preferably, when the ciphertext generation module performs data preprocessing on the data acquired by the data acquisition and reading module, the data preprocessing method selected includes: A31: Data cleaning, i.e. removing invalid or erroneous data; A32: Format conversion, that is, converting data into the format required by the encryption algorithm; A33: Data integration is combining data from multiple fields into a single data string.

[0014] Preferably, the code generation module collects and organizes the ciphertexts generated by all processes of the same product in the product production line, and generates the code according to the collected keys, including the following steps: S51: Loading preset rules and algorithms for generating product codes from a configuration file or a database, wherein the preset rules for generating product codes include a key sorting method, integration logic, and encoding rules; S52: Retrieving all ciphertexts corresponding to the same product generated by the ciphertext generation module stored in the data storage module; S53: sorting the retrieved keys according to a preset rule; S54: Processing the sorted keys according to a preset integration logic, wherein the processing methods adopted include: merging key fragments, calculating hash values, and performing specific encoding conversion; S55: converting the integrated key data into a product code according to a preset algorithm and rules; S56: Associating the generated product code with the corresponding identification number.

[0015] Preferably, when the code generation module retrieves all ciphertexts corresponding to the same product generated by the ciphertext generation module stored in the data storage module, the code generation module includes the following steps: S61: query the data in the data storage module to query the ciphertext corresponding to the data generated by the RFID tag reader at the finished product exit of the production line; S62: Identify the identification number corresponding to the queried ciphertext; S63: searching the data storage module according to the identified identification number to find all ciphertexts corresponding to the identification number; S64: Retrieve the queried ciphertext.

[0016] A method for generating a product code based on an RFID tag comprises the following steps: S71: Initialize the RFID tag, assign an identification number, and attach the RFID tag to the product; S72: using an RFID tag reader to read the RFID tag, and recording the reading result and processing information; S73: Process and encrypt the recorded processing information to obtain ciphertext, and associate the obtained ciphertext with the identification number; S74: After the product processing is completed, all ciphertexts corresponding to the identification number of the RFID tag attached to the product are retrieved; S75: Integrate and calculate the retrieved ciphertext to obtain a product code.

[0017] Beneficial effects of the present invention: 1. Compared with the existing technology, when tracking and tracing the products produced in the production line, the manual record or barcode management method is used to track and trace the product production process, which is time-consuming and labor-intensive, and has low accuracy. In addition, the recorded data content is not sufficient and comprehensive, and it is difficult to meet the requirements of modern production for efficiency, accuracy and traceability. This system combines RFID technology with encryption algorithms, and generates a key based on the results of each scan of the RFID tag, so that the production information of the product can be traced back to each process and link, which is convenient for the rapid location and resolution of quality problems. 2. Products can be marked by RFID tags and RFID tag readers, and the production information of products can be tracked and recorded by data acquisition and reading modules and ciphertext generation modules, so as to obtain the information of each process of the product during production, and record the process information as ciphertext. Finally, all ciphertexts are integrated by the code generation module to obtain the unique product code of the product. The product code contains a variety of product information such as the product production plant, product production line, product production time, product processing processes, and the person in charge of each process, thus providing strong support for product traceability and management; 3. The ciphertext generation module ensures the security of data format and content through data preprocessing, improves data encryption strength by using exclusive key generation technology, realizes the generation of fixed-length ciphertext, and is closely associated with the RFID tag identification number. This series of operations not only significantly enhances data security, but also greatly improves data traceability; at the same time, this process optimizes the information management process, supports efficient product query and anti-counterfeiting verification, reduces manual intervention, reduces the risk of errors, and lays a solid foundation for the automation and intelligent upgrade of the system, thereby comprehensively improving the overall performance and value of the product code generation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 What is shown is a schematic diagram of the structure of the product code generation system based on RFID tag of the present invention; Figure 2 The following is a schematic diagram of the working process of the code generation module in the product code generation system based on the RFID tag of the present invention; Figure 3 What is shown is a flow chart of the product code generation method based on RFID tag of the present invention. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] See also Figure 1-Figure 2 The present invention provides an embodiment: a product code generation system based on an RFID tag, comprising: Product production line, used to produce the required products in the form of assembly line operation; RFID tags, which are attached to products and are used to store and transmit information; RFID tag readers and writers are deployed in various processes of the production line to read and write information in RFID tags; The data acquisition and reading module is used to obtain the data read by the RFID tag reader from the RFID tag reader, wherein the read data includes time, operator number, factory number and production line number; The ciphertext generation module is used to generate a unique ciphertext using a preset algorithm according to the data acquired by the data acquisition and reading module; The code generation module is used to collect and organize the ciphertexts generated by all processes of the same product in the product production line, and generate codes based on the collected keys; A data storage module is used to store and back up the data generated by the data acquisition and reading module, the ciphertext generation module, and the code generation module; The management control module is used to monitor and manage the operation of the RFID tag reader, data acquisition and reading module, ciphertext generation module, code generation module and data storage module.

[0021] Preferably, products can be marked by RFID tags and RFID tag readers, and the production information of products can be tracked and recorded by data acquisition and reading modules and ciphertext generation modules to obtain information on each process of product production, and record the process information in the form of ciphertext. Finally, all ciphertexts are integrated using the code generation module to obtain a unique product code for the product. The product code contains a variety of product information such as the product production plant, product production line, product generation time, product processing steps, and person in charge of each product processing step, thereby providing strong support for product traceability and management.

[0022] Preferably, when attaching the RFID tag to the product, the following steps are included: S11: pre-configuring the data storage area inside the RFID tag through a dedicated RFID programming device and software, wherein the production date information and the production batch information of the product are entered into the data storage area of ​​the RFID tag; S12: At the initial stage of product production, the RFID tag is attached to the product, wherein the attachment methods used include pasting and embedding; S13: Using RFID programming equipment or software, assign a globally unique identification number to each RFID tag.

[0023] Preferably, when the RFID tag reader is deployed on the production line, the RFID tag reader deployment method includes: A11: Deploy an RFID tag reader at the start of the production line to read the production date and production batch information of the new products entering the production line; A12: Deploy RFID tag readers at each key process point on the production line to track and record product processing information; A13: Deploy RFID tag readers at the exit of finished products on the production line to verify product information; A14: Deploy RFID tag readers in the buffer and temporary storage areas of the production line to track the temporary storage and circulation of products.

[0024] Preferably, the RFID tag reader / writer includes the following steps when reading and writing information in the RFID tag: S21: The RFID tag reader transmits a radio frequency signal of a certain frequency and power through its antenna, and this signal forms an electromagnetic field in space; S22: When the RFID tag enters the RF field range emitted by the reader, the antenna in the tag captures enough energy to activate the RFID tag; S23: After the RFID tag is activated, the data stored in the RFID tag is sent back to the RFID tag reader / writer through backscatter modulation technology according to the pre-stored instructions and the request of the RFID tag reader / writer; S24: the RFID tag reader / writer decodes and identifies the data stored in the RFID tag, and identifies the identification number stored in the storage area of ​​the RFID tag; S25: Record the current product processing information according to the identification number stored in the storage area of ​​the identified RFID tag.

[0025] Preferably, when the RFID tag reader / writer records the current product processing information according to the identification number stored in the storage area of ​​the identified RFID tag, the recorded product processing information includes: A21: The time information of the product passing through the current process point, where the accuracy of the time information is accurate to seconds; A22: The operator number of the process point that the product passes through; A23: The production line number of the product; A24: The factory number where the product is produced.

[0026] Preferably, when the data acquisition module obtains the data read by the RFID tag reader from the RFID tag reader, the following steps are included: S31: The data acquisition and reading module enters the monitoring state and receives data packets from the RFID tag reader in real time; S32: parsing the received data packet, that is, separating each field in the data packet one by one according to a predetermined protocol and format; S33: extracting information from the parsed data packet, and then formatting the extracted information to convert the parsed information into a unified format; S34: Preliminary processing is performed on the extracted information, wherein the preliminary processing methods include deduplication, sorting and classification.

[0027] Preferably, when the ciphertext generation module generates a unique ciphertext using a preset algorithm according to the data acquired by the data acquisition and reading module, the ciphertext generation module includes the following steps: S41: Data preprocessing, processing the data into a data format and content suitable for key generation; S42: key generation, generating a unique key according to one or more of the factory number, the production line number and the production line number; S43: Data encryption processing, using the key obtained in step S42 to encrypt the data to obtain a ciphertext of a fixed length; S44: Ciphertext association processing, associating the obtained ciphertext with the identification number stored in the RFID tag corresponding to the product.

[0028] Preferably, the ciphertext generation module ensures the security of data format and content through data preprocessing, improves data encryption strength by using exclusive key generation technology, realizes the generation of fixed-length ciphertext, and is closely associated with the RFID tag identification number. This series of operations not only significantly enhances the security of the data, but also greatly improves the traceability of the data; at the same time, this process optimizes the information management process, supports efficient product query and anti-counterfeiting verification, reduces manual intervention, reduces the risk of errors, and lays a solid foundation for the automation and intelligent upgrade of the system, thereby comprehensively improving the overall performance and value of the product code generation system.

[0029] Preferably, when the ciphertext generation module performs data preprocessing on the data acquired by the data acquisition and reading module, the data preprocessing method selected includes: A31: Data cleaning, i.e. removing invalid or erroneous data; A32: Format conversion, that is, converting data into the format required by the encryption algorithm; A33: Data integration is combining data from multiple fields into a single data string.

[0030] Preferably, the code generation module collects and organizes the ciphertexts generated by all processes of the same product in the product production line, and generates the code according to the collected keys, including the following steps: S51: Loading preset rules and algorithms for generating product codes from a configuration file or a database, wherein the preset rules for generating product codes include a key sorting method, integration logic, and encoding rules; S52: Retrieving all ciphertexts corresponding to the same product generated by the ciphertext generation module stored in the data storage module; S53: sorting the retrieved keys according to a preset rule; S54: Processing the sorted keys according to a preset integration logic, wherein the processing methods adopted include: merging key fragments, calculating hash values, and performing specific encoding conversion; S55: converting the integrated key data into a product code according to a preset algorithm and rules; S56: Associating the generated product code with the corresponding identification number.

[0031] Preferably, when the code generation module retrieves all ciphertexts corresponding to the same product generated by the ciphertext generation module stored in the data storage module, the code generation module includes the following steps: S61: query the data in the data storage module to query the ciphertext corresponding to the data generated by the RFID tag reader at the finished product exit of the production line; S62: Identify the identification number corresponding to the queried ciphertext; S63: searching the data storage module according to the identified identification number to find all ciphertexts corresponding to the identification number; S64: Retrieve the queried ciphertext.

[0032] See also Figure 3 The present invention provides an embodiment: a method for generating a product code based on an RFID tag, comprising the following steps: S71: Initialize the RFID tag, assign an identification number, and attach the RFID tag to the product; S72: Using an RFID tag reader to read the RFID tag, and recording the reading result and processing information; S73: Process and encrypt the recorded processing information to obtain ciphertext, and associate the obtained ciphertext with the identification number; S74: After the product processing is completed, all ciphertexts corresponding to the identification number of the RFID tag attached to the product are retrieved; S75: Integrate and calculate the retrieved ciphertext to obtain a product code.

[0033] Through the above steps, compared with the prior art in which manual records or barcode management are used to track and trace the products produced in the production line, the production process is tracked and traced, which is time-consuming and labor-intensive, and has low accuracy. In addition, the recorded data content is not sufficient and comprehensive, and it is difficult to meet the requirements of modern production for efficiency, accuracy and traceability. The system combines RFID technology with an encryption algorithm, and generates a key based on the result of each scan of the RFID tag, so that the production information of the product can be traced back to each process and link, which is convenient for the rapid location and resolution of quality problems.

[0034] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention.

Claims

1. A product code generation system based on RFID tags; characterized by: Included are: Product production line, used to produce the required products in the form of assembly line operation; RFID tags, which are attached to products and are used to store and transmit information; RFID tag readers and writers are deployed in various processes of the production line to read and write information in RFID tags; The data acquisition and reading module is used to obtain the data read by the RFID tag reader from the RFID tag reader, wherein the read data includes time, operator number, factory number and production line number; The ciphertext generation module is used to generate a unique ciphertext using a preset algorithm according to the data acquired by the data acquisition and reading module; The code generation module is used to collect and organize the ciphertexts generated by all processes of the same product in the product production line, and generate codes based on the collected keys; A data storage module is used to store and back up the data generated by the data acquisition and reading module, the ciphertext generation module, and the code generation module; The management control module is used to monitor and manage the operation of the RFID tag reader, data acquisition and reading module, ciphertext generation module, code generation module and data storage module.

2. The product code generation system based on RFID tag according to claim 1, characterized in that: When attaching an RFID tag to a product, the following steps are included: S11: pre-configuring the data storage area inside the RFID tag through a dedicated RFID programming device and software, wherein the production date information and the production batch information of the product are entered into the data storage area of ​​the RFID tag; S12: At the initial stage of product production, the RFID tag is attached to the product, wherein the attachment methods used include pasting and embedding; S13: Using RFID programming equipment or software, assign a globally unique identification number to each RFID tag.

3. The product code generation system based on RFID tag according to claim 2, characterized in that: When deploying RFID tag readers on the production line, the RFID tag reader deployment methods include: A11: Deploy an RFID tag reader at the start of the production line to read the production date and production batch information of the new products entering the production line; A12: Deploy RFID tag readers at each key process point on the production line to track and record product processing information; A13: Deploy RFID tag readers at the exit of finished products on the production line to verify product information; A14: Deploy RFID tag readers in the buffer and temporary storage areas of the production line to track the temporary storage and circulation of products.

4. The product code generation system based on RFID tag according to claim 3, characterized in that: The RFID tag reader / writer includes the following steps when reading and writing information in the RFID tag: S21: The RFID tag reader transmits a radio frequency signal of a certain frequency and power through its antenna, and this signal forms an electromagnetic field in space; S22: When the RFID tag enters the RF field range emitted by the reader, the antenna in the tag captures enough energy to activate the RFID tag; S23: After the RFID tag is activated, the data stored in the RFID tag is sent back to the RFID tag reader / writer through backscatter modulation technology according to the pre-stored instructions and the request of the RFID tag reader / writer; S24: the RFID tag reader / writer decodes and identifies the data stored in the RFID tag, and identifies the identification number stored in the storage area of ​​the RFID tag; S25: Record the current product processing information according to the identification number stored in the storage area of ​​the identified RFID tag.

5. The product code generation system based on RFID tag according to claim 4, characterized in that: When the RFID tag reader records the current product processing information according to the identification number stored in the storage area of ​​the identified RFID tag, the recorded product processing information includes: A21: The time information of the product passing through the current process point, where the accuracy of the time information is accurate to seconds; A22: The operator number of the process point that the product passes through; A23: The production line number of the product; A24: The factory number where the product is produced.

6. The product code generation system based on RFID tag according to claim 5, characterized in that: When the data acquisition module obtains the data read by the RFID tag reader from the RFID tag reader, the following steps are included: S31: The data acquisition and reading module enters the monitoring state and receives data packets from the RFID tag reader in real time; S32: parsing the received data packet, that is, separating each field in the data packet one by one according to a predetermined protocol and format; S33: extracting information from the parsed data packet, and then formatting the extracted information to convert the parsed information into a unified format; S34: Preliminary processing is performed on the extracted information, wherein the preliminary processing methods include deduplication, sorting and classification.

7. The product code generation system based on RFID tag according to claim 6, characterized in that: The ciphertext generation module generates a unique ciphertext using a preset algorithm based on the data acquired by the data acquisition and reading module, including the following steps: S41: Data preprocessing, processing the data into a data format and content suitable for key generation; S42: key generation, generating a unique key according to one or more of the factory number, the production line number and the production line number; S43: Data encryption processing, using the key obtained in step S42 to encrypt the data to obtain a ciphertext of a fixed length; S44: Ciphertext association processing, associating the obtained ciphertext with the identification number stored in the RFID tag corresponding to the product.

8. The product code generation system based on RFID tag according to claim 7, characterized in that: When the ciphertext generation module performs data preprocessing on the data acquired by the data acquisition and reading module, the data preprocessing methods selected include: A31: Data cleaning, i.e. removing invalid or erroneous data; A32: Format conversion, that is, converting data into the format required by the encryption algorithm; A33: Data integration is combining data from multiple fields into a single data string.

9. The product code generation system based on RFID tag according to claim 8, characterized in that: The code generation module collects and organizes the ciphertexts generated by all processes of the same product in the product production line, and generates codes based on the collected keys, including the following steps: S51: Loading preset rules and algorithms for generating product codes from a configuration file or a database, wherein the preset rules for generating product codes include a key sorting method, integration logic, and encoding rules; S52: Retrieving all ciphertexts corresponding to the same product generated by the ciphertext generation module stored in the data storage module; S53: sorting the retrieved keys according to a preset rule; S54: Processing the sorted keys according to a preset integration logic, wherein the processing methods adopted include: merging key fragments, calculating hash values, and performing specific encoding conversion; S55: converting the integrated key data into a product code according to a preset algorithm and rules; S56: Associating the generated product code with the corresponding identification number.

10. The method for generating a product code based on an RFID tag according to claim 9, characterized in that: The following steps are included: S71: Initialize the RFID tag, assign an identification number, and attach the RFID tag to the product; S72: using an RFID tag reader to read the RFID tag, and recording the reading result and processing information; S73: Process and encrypt the recorded processing information to obtain ciphertext, and associate the obtained ciphertext with the identification number; S74: After the product processing is completed, all ciphertexts corresponding to the identification number of the RFID tag attached to the product are retrieved; S75: Integrate and calculate the retrieved ciphertext to obtain a product code.

Images